feat(sheet): show Min and Max in the status-bar stats (#363)

Excel's status bar shows Average/Count/Min/Max/Sum for a numeric
selection; we only had Average/Count/Sum. Adds Min and Max to the same
single-pass scan. E2e assertion extended.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: SamTV12345

playwright/specs/sheet_excel_chrome.spec.ts

@@ -104,7 +104,7 @@ test.describe('Sheet Excel chrome', () => {
     await expect(cell(page, 0, 0)).toHaveText('neu2');
   });
 
-  test('statusbar shows average, count, and sum for a numeric selection', async ({ page }) => {
+  test('statusbar shows average, count, min, max, and sum for a numeric selection', async ({ page }) => {
     const padId = `xl-stats-${Date.now()}`;
     await openSheet(page, padId);
     await commitCell(page, 0, 0, '1'); // A1
@@ -116,6 +116,8 @@ test.describe('Sheet Excel chrome', () => {
     const stats = page.locator('.sheet-statusbar .sheet-stats');
     await expect(stats).toContainText('Average: 2');
     await expect(stats).toContainText('Count: 3');
+    await expect(stats).toContainText('Min: 1');
+    await expect(stats).toContainText('Max: 3');
     await expect(stats).toContainText('Sum: 6');
   });
 

ui/src/js/sheet/sheetEditor.ts

@@ -137,6 +137,8 @@ export function startSheetEditor(root: HTMLElement): void {
     let sum = 0;
     let numCount = 0;
     let count = 0;
+    let min = Infinity;
+    let max = -Infinity;
     for (const { row, col } of selCells(selection)) {
       const raw = rawValue(row, col);
       if (raw === '') continue;
@@ -146,13 +148,16 @@ export function startSheetEditor(root: HTMLElement): void {
       if (value.trim() !== '' && Number.isFinite(n)) {
         sum += n;
         numCount++;
+        if (n < min) min = n;
+        if (n > max) max = n;
       }
     }
     if (numCount === 0) return;
     // toPrecision(12) strips float noise (0.1+0.2 -> 0.3) without truncating
     // typical spreadsheet magnitudes.
     const f = (n: number): string => String(parseFloat(n.toPrecision(12)));
-    for (const part of [`Average: ${f(sum / numCount)}`, `Count: ${count}`, `Sum: ${f(sum)}`]) {
+    // Excel status-bar order: Average, Count, Min, Max, Sum.
+    for (const part of [`Average: ${f(sum / numCount)}`, `Count: ${count}`, `Min: ${f(min)}`, `Max: ${f(max)}`, `Sum: ${f(sum)}`]) {
       const s = document.createElement('span');
       s.textContent = part;
       statsEl.appendChild(s);